Variability and Main Controlling Factors of Hydrocarbon Migration and Accumulation in the Lower Paleozoic Carbonate Rocks of the Tazhong Uplift, the Tarim Basin, Northwest China

Figure 1

Structures and stratigraphy of the Tazhong Uplift. (a) The regional structures and the distribution of the petroliferous zone across the top of the carbonate rocks of the Tazhong Uplift, showing the abundance of oil (in the west) and gas (in the east), and convergence of the distribution from west to east. (b) The Lower Paleozoic stratigraphic column, showing that the Cambrian-Ordovician carbonate rocks form three reservoir-cap assemblages (upper, middle, and lower) typical of the type and contact relations of reservoir and cap rocks. Following the convention of the PetroChina Tarim Oilfield Company, which divides the Cambrian System into three series, this paper adopts the terms Lower, Middle, and Upper Cambrian Series.